nihongo de kaiwa no renshuu o suru to, nihongo ga dondon jouzu ni narimasu.

If you practice conversation in Japanese, your Japanese will quickly get better and better.

Breakdown of nihongo de kaiwa no renshuu o suru to, nihongo ga dondon jouzu ni narimasu.

• を: direct object particle
• 日に本ほん語ご: Japanese (language)
• が: subject particle

Questions & Answers about nihongo de kaiwa no renshuu o suru to, nihongo ga dondon jouzu ni narimasu.

Why is the particle で used after 日本語? Why not を or に?

で here marks the means / medium by which the action is done.

• 日本語で会話の練習をする
  = “to do conversation practice in Japanese”

In English we say “speak in Japanese” or “practice in Japanese,” but Japanese treats this “in” as the same kind of thing as “with a pen” or “by bus” and uses で:

• ペンで書く – to write with a pen
• バスで行く – to go by bus
• 日本語で話す – to speak in Japanese

Why not を?

• を would mark 日本語 as a direct object:
  • 日本語を勉強する – to study Japanese
    Here the action is done to Japanese (you study it), but in your sentence, you are not practicing Japanese itself; you are practicing conversation, and you are doing that practice in Japanese.

Why not に?

• に often marks a target/destination or time:
  • 学校に行く – go to school
  • ３時に会う – meet at 3 o’clock
    It doesn’t fit the idea of “using Japanese as the medium” as well as で does.

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What exactly is the function of の in 会話の練習?